while the idea of the solar staker looks good to me, I think that a single solar array powering multiple devices (including PCs) is much more convenient and efficient.
one PC consumes at least 400 W, so you need something like 2x 250w mono-crystalline solar panel, add the solar charger, the converter, and you easily pay at lest $500
And what happens when it's night ?

Typically you would want to do a grid tied system and overbuild it to deliver more power than you would need during the day. The excess power would be sold back to the grid during the day and you would use grid power in the evening.
A battery bank is an option but this also depends on your location and the amount of sun you get in your area and cloudy/rainy days
small consumer wind turbines are becoming less expensive and can be a good choice for a hybrid solar power system in windy locations.
The better choice would be to replace energy wasting appliances and lights(60 watt bulb to 5 watt led) and use a system built with the latest energy efficient technology
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130881 quad core 6 watts
You're absolutely right! I recently changed out all of my old bulbs for LED edison bulbs. This build is mainly going to be for the non-technical members and the members that are just getting interested in environmental-friendly living. Thanks for the post!